Search: Posts Made By: m4gnum
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10-07-19, 11:50 PM
Replies: 29
Views: 432
Posted By PJmax

3A should be fine. It it blows out by itself.......

3A should be fine. It it blows out by itself.... change it to 4A otherwise leave it.
I'm not really sure exactly what that switch does. Leave it like it was.

All good here. Glad you got it going....
10-07-19, 11:30 PM
Replies: 29
Views: 432
Posted By PJmax

You checked from R to C at stat and didn't get...

You checked from R to C at stat and didn't get 24v. Try measuring from R to Y or G or W.
Those should also show 24v.

I can't see anything major going bad since I'm sure the fuse blew.
10-07-19, 11:18 PM
Replies: 29
Views: 432
Posted By PJmax

That's very good. The transformer is good. That...

That's very good. The transformer is good. That fuse is in the R wire. So that means 24v should appear at an R screw terminal on the terminal block. See if you can find 24v on R. If yes..... you need...
10-07-19, 11:08 PM
Replies: 29
Views: 432
Posted By PJmax

I see the light. I don't know if that's 120v or...

I see the light. I don't know if that's 120v or comes off the 24v supply.

Yes..... there are two metal tabs in the top of the fuse.
10-07-19, 10:55 PM
Replies: 29
Views: 432
Posted By PJmax

The two heavy wires at the top are 120 or 240...

The two heavy wires at the top are 120 or 240 which is why the pen activates. Many of those pens don't work under 50vAC. There may be 120v in that Carrier box too.

Using your meter...... your...
10-07-19, 10:35 PM
Replies: 29
Views: 432
Posted By PJmax

On your meter...... use the next step down........

On your meter...... use the next step down..... with ~ over the V.
Now select AC by pushing the AC/DC button.
You are measuring for 24v AC..... not DC.
10-07-19, 09:37 PM
Replies: 29
Views: 432
Posted By PJmax

Is the blower door in place ? Usually there is a...

Is the blower door in place ? Usually there is a safety switch that will kill the unit.

If you have a meter..... check for 24vAC from R to C at the thermostat.

If I'm not mistaken..... the fuse...
10-07-19, 08:12 PM
Replies: 29
Views: 432
Posted By PJmax

Yes... you will need to get to the wiring on the...

Yes... you will need to get to the wiring on the back if that is a mounted fuseholder.
The factory fuse is 3.2A so a 3A should be fine. 5A is too big.
10-07-19, 06:37 PM
Replies: 29
Views: 432
Posted By PJmax

You shorted the C wire to the R wire when...

You shorted the C wire to the R wire when replacing the stat.

As far as I know..... the fuse is part of the cap. HD will not stock that replacement.

Yes..... go to an auto parts store. Get a...
10-07-19, 06:10 PM
Replies: 29
Views: 432
Posted By PJmax

That fuse holder can be tough to get together....

That fuse holder can be tough to get together. Check the fuse with your ohmmeter. It's probably open.
I rarely change them anymore. I replace the fuseholder and fuse to the new plastic type fuse....
10-07-19, 05:28 PM
Replies: 29
Views: 432
Posted By PJmax

That switch was originally set up to kill the...

That switch was originally set up to kill the light when the blower door was open to keep from exposure to the UV light. I'm not really sure how effective they are.
10-07-19, 05:12 PM
Replies: 29
Views: 432
Posted By PJmax

The germicidal light is ultraviolet so DON'T look...

The germicidal light is ultraviolet so DON'T look at it if it's powered.
The tubes only have a limited life and it may be bad.

I don't see the transformer. It may be inside that metal box where...
10-07-19, 04:55 PM
Replies: 29
Views: 432
Posted By PJmax

I removed the pictures as un-needed. That is a...

I removed the pictures as un-needed.
That is a power supply that runs the germicidal light. It's printed right on it.
10-07-19, 04:50 PM
Replies: 29
Views: 432
Posted By PJmax

Post a larger picture of the wiring area in the...

Post a larger picture of the wiring area in the air handler.

These parts should be in your air handler.
Transformer...
10-07-19, 04:29 PM
Replies: 29
Views: 432
Posted By PJmax

Welcome to the forums. You probably switched...

Welcome to the forums.

You probably switched power off to the condenser...... however the circuit originates in the air handler. You either blew a fuse or the 24v transformer.

A non contact pen...
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